Night security light

Posted on Feb 5, 2014

This simple circuit is build around a CMOS IC 4060 to obtain the required timing. During day time the LDR has low resistance and keeps the pin 12 of the IC1 high, preventing the IC1 from oscillating. When it is dark the LDR resistance becomes high and the pin 12 of IC1 becomes low and the IC starts oscillating, which indicated by the flashing of L

Night security light
Click here to download the full size of the above Circuit.

ED D3. The values of the timing components R1, R2, C4 are so selected that the out put pin3 of IC1 goes high after 8 hours. That means the high output drives the triac to switch on the lamp around 2`O clock. At morning, the LDR resistance drops and the pin 12 of IC1 goes high and stops the oscillation, making the lamp OFF. The switch S1 can be used to manually ON the lamp. The capacitor C2 prevents false triggering.

Leave Comment

characters left:

New Circuits



Popular Circuits

Bridge balance indicator
Proximity Alarm I Circuit
digital logic purpose of diode in this 555 timer application
mic circuit
complete 70 watt power amplifier schematic
digital alarm clock using pic
Electronic Torricelli Barometer
How To Build A Simple Code-Operated Switch